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  #51  
Old 04-18-2019, 12:19 PM
Shawn Everette Shawn Everette is offline
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Before, way before. The final nail in the coffin came when a renter decided to do a plaster cast in it ... and forgot to put the thermocouple back in.
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  #52  
Old 04-18-2019, 01:20 PM
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Pete VanderLaan Pete VanderLaan is offline
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well, given the construction, eventually the room would come up to temperature if you know what I mean.
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Old 04-18-2019, 01:47 PM
Shawn Everette Shawn Everette is offline
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I did a complete overhaul, 20 gauge sheet metal seems like a poor choice for framing material. That one was ancient, still had the old rheostat controls.
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Old 04-18-2019, 01:57 PM
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Richard Huntrods Richard Huntrods is offline
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Quote:
Originally Posted by Randy Kaltenbach View Post
I've been thinking about this. How hot would the exterior likely reach? I don't want to skin it with galvanized metal if it's too hot.
Randy, sheet metal is a terrible skin. The expanded steel mesh is much better as it doesn't become a radiating surface like the sheet.

My annealer is a 17" kiln, brick with 1/4" frax and then sheet metal. At 920 you can get an instant 2nd degree burn if you touch it with your knee. (ask me how i know!).

My furnace has more insulation (1" rigid board, 2" roxul) and expanded mesh. At 2100F the exterior is 150F (measured). Hot, but you can touch it and not get burned. I've put my hand on it for 20-30sec without ill effect.

Part of that is the much greater insulation around the brick 'hot zone', but the expanded mesh is just a much superior "skin". If you worry about fiber 'bits' in the air, just spray paint the thing with black hi-temp engine paint. Works wonderfully.
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